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"""Unified RPKI date/time handling, based on the standard Python datetime module.
Module name chosen to sidestep a nightmare of import-related errors
that occur with the more obvious module names.
$Id$
Copyright (C) 2007--2008 American Registry for Internet Numbers ("ARIN")
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND ARIN DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. IN NO EVENT SHALL ARIN BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
"""
import datetime as pydatetime
import re
def now():
"""Get current timestamp."""
return datetime.utcnow()
class datetime(pydatetime.datetime):
"""RPKI extensions to standard datetime.datetime class. All work
here is in UTC, so we use naive datetime objects.
"""
def totimestamp(self):
"""Convert to seconds from epoch (like time.time()). Conversion
method is a bit silly, but avoids time module timezone whackiness.
"""
return int(self.strftime("%s"))
@classmethod
def fromUTCTime(cls, x):
"""Convert from ASN.1 UTCTime."""
return cls.strptime(x, "%y%m%d%H%M%SZ")
def toUTCTime(self):
"""Convert to ASN.1 UTCTime."""
return self.strftime("%y%m%d%H%M%SZ")
@classmethod
def fromGeneralizedTime(cls, x):
"""Convert from ASN.1 GeneralizedTime."""
return cls.strptime(x, "%Y%m%d%H%M%SZ")
def toGeneralizedTime(self):
"""Convert to ASN.1 GeneralizedTime."""
return self.strftime("%Y%m%d%H%M%SZ")
@classmethod
def fromASN1tuple(cls, x):
"""Convert from ASN.1 tuple representation."""
assert isinstance(x, tuple) and len(x) == 2 and x[0] in ("utcTime", "generalTime")
if x[0] == "utcTime":
return cls.fromUTCTime(x[1])
else:
return cls.fromGeneralizedTime(x[1])
## @var PKIX_threshhold
# Threshold specified in RFC 3280 for switchover from UTCTime to GeneralizedTime.
PKIX_threshhold = pydatetime.datetime(2050, 1, 1)
def toASN1tuple(self):
"""Convert to ASN.1 tuple representation."""
if self < self.PKIX_threshhold:
return "utcTime", self.toUTCTime()
else:
return "generalTime", self.toGeneralizedTime()
@classmethod
def fromXMLtime(cls, x):
"""Convert from XML time representation."""
if x is None:
return None
else:
return cls.strptime(x, "%Y-%m-%dT%H:%M:%SZ")
def toXMLtime(self):
"""Convert to XML time representation."""
return self.strftime("%Y-%m-%dT%H:%M:%SZ")
def __str__(self):
return self.toXMLtime()
@classmethod
def fromdatetime(cls, x):
"""Convert a datetime.datetime object into this subclass.
This is whacky due to the weird constructors for datetime.
"""
return cls.combine(x.date(), x.time())
def __add__(self, other):
"""Force correct class for timedelta results."""
return self.fromdatetime(pydatetime.datetime.__add__(self, other))
def __sub__(self, other):
"""Force correct class for timedelta results."""
return self.fromdatetime(pydatetime.datetime.__sub__(self, other))
@classmethod
def from_sql(cls, x):
"""Convert from SQL storage format."""
return cls.fromdatetime(x)
def to_sql(self):
"""Convert to SQL storage format.
There's something whacky going on in the MySQLdb module, it throws
range errors when storing a derived type into a DATETIME column.
Investigate some day, but for now brute force this by copying the
relevant fields into a datetime.datetime for MySQLdb's
consumption.
"""
return pydatetime.datetime(year = self.year, month = self.month, day = self.day,
hour = self.hour, minute = self.minute, second = self.second,
microsecond = 0, tzinfo = None)
def later(self, other):
"""Return the later of two timestamps."""
return other if other > self else self
def earlier(self, other):
"""Return the earlier of two timestamps."""
return other if other < self else self
class timedelta(pydatetime.timedelta):
"""Timedelta with text parsing. This accepts two input formats:
- A simple integer, indicating a number of seconds.
- A string of the form "wD xH yM zS" where w, x, y, and z are integers
and D, H, M, and S indicate days, hours, minutes, and seconds.
All of the fields are optional, but at least one must be specified.
Eg, "3D4H" means "three days plus four hours".
"""
## @var regexp
# Hideously ugly regular expression to parse the complex text form.
# Tags are intended for use with re.MatchObject.groupdict() and map
# directly to the keywords expected by the timedelta constructor.
regexp = re.compile("\\s*".join(("^",
"(?:(?P<days>\\d+)D)?",
"(?:(?P<hours>\\d+)H)?",
"(?:(?P<minutes>\\d+)M)?",
"(?:(?P<seconds>\\d+)S)?",
"$")),
re.I)
@classmethod
def parse(cls, arg):
"""Parse text into a timedelta object."""
if not isinstance(arg, str):
return cls(seconds = arg)
elif arg.isdigit():
return cls(seconds = int(arg))
else:
match = cls.regexp.match(arg)
if match:
return cls(**dict((k, int(v)) for (k, v) in match.groupdict().items() if v is not None))
else:
raise RuntimeError, "Couldn't parse timedelta %s" % repr(arg)
def convert_to_seconds(self):
"""Convert a timedelta interval to seconds."""
return self.days * 24 * 60 * 60 + self.seconds
if __name__ == "__main__":
def test(t):
print
print "str: ", t
print "repr: ", repr(t)
print "seconds since epoch:", t.strftime("%s")
print "UTCTime: ", t.toUTCTime()
print "GeneralizedTime: ", t.toGeneralizedTime()
print "ASN1tuple: ", t.toASN1tuple()
print "XMLtime: ", t.toXMLtime()
print
print
print "Testing time conversion routines"
test(now())
test(now() + timedelta(days = 30))
test(now() + timedelta.parse("3d5s"))
timedelta.parse(" 3d 5s ")
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